System and method for fiber optics based direct view giant screen flat panel display

• US 20070036492A1
• Filed: 08/15/2005
• Published: 02/15/2007
• Est. Priority Date: 08/15/2005
• Status: Active Grant

• Current Assignee: General Display, Ltd.
• Original Assignee: General Display, Ltd.
• Inventors: Lee, Yee
• Granted Patent: US 7,233,722 B2
• Time in Patent Office: Days
• US Class Current: 385/89
• CPC Class Codes: G02B 6/3538 based on displacement or deformation of a liquid controlling the intensity of light by displacement or deformation of a fluid in general G02B26/004; fluid-filled lens of variable focal length G02B3/14
• CPC Class Codes: G09G 3/001 using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background slide projectors per se G03B23/00 = 42 HP

Abstract

An apparatus and method for displaying large format images, graphics, and videos. The apparatus comprise a layer of column oriented optical fibers, each fiber is illuminated at one end by at least one laser diode, and a second layer which sits in front of the first layer and is parallel to the first layer, whose projected area substantially overlap that of the first layer. The second layer comprises a plurality of optical fibers arranged in rows. In between the first and second layer sits a third layer of optical switching elements. Alternatively, the second layer can be a light diffusing layer. Laser lights emitted from the laser diodes travel in parallel along respective column fiber until they are redirected by optical switching elements which couple the laser lights within the column fibers to the row fibers or to the difflusing layer directly whereby they are scattered by the diffusing elements to reach the viewing audience. The small size of the fibers results in very small fill factor, allowing light absorbing matrix and backing layer to absorb ambient light effectively. The contrast ratio under ambient light condition is further enhanced by the use of multilayer dielectric optical filter to preferentially absorb ambient light.

Claims

1. ) An apparatus comprising:

a first layer having a distal end comprising column fibers of non-touching optical fibers arranged in a column, each respective optical fiber to be illuminated at one end by at least one laser diode, and

a second layer substantially parallel to said first layer comprising row fibers optical fibers arranged in rows; and

a third layer between the first and second layer, the third layer comprising optical switching elements.

2. ) The apparatus of claim 1 wherein each said switching element can be optically coupled to optical fibers in said first layer and optical fibers in said second layer simultaneously.

3. ) The apparatus of claim 1 wherein each said laser diode is able to emit at least one of narrowband light wave of substantially one wavelength, and two or more single wavelength colors.

4. ) The apparatus of claim 3 wherein a proximal face of each said fiber of the second layer is coupled to a multitude of wavelength specific narrow pass band optical filters.

5. ) The apparatus of claim 4 wherein each said narrow pass band optical filter is at least one of to pass tnansmission of laser light, absorptive relative to wavelength not within the pass band of said optical filter, and a multilayer dielectric optical filter.

6. ) The apparatus of claim 1 wherein each fiber of said fiber comprises an optical fiber sheath and a non-concentric optical fiber core.

7. ) The apparatus of claim 6 wherein each said optical fiber core has a portion of a core boundary substantially uncovered by said optical fiber sheath on a proximal side.

8. ) The apparatus of claim 2 wherein said optical switching element is capable of intercepting a laser wave field of the column fiber of the first layer when said switching element is actuated.

9. ) The apparatus of claim 1, further comprising an ambient light absorbing fourth layer.

10. ) The apparatus of claim 1, wherein said apparatus is to provide a display.

11. ) The apparatus of claim 1, further comprising an ambient light absorbing matrix of light absorbing material to block inter-pixel crosstalk.

12. ) The apparatus of claim 1 wherein each proximal face of said fiber of the second layer includes a diffuser to scatter laser light out of the row fiber.

13. ) The apparatus of claim 12, wherein the diffusers each comprise at least one of a random, two dimensional Bragg grating carved into the proximal face of said row fiber and a random, two dimensional undulations etched into a proximal face of each fiber of said row fiber.

14. ) The apparatus of claim 1 wherein said third layer is coupled optically and mechanically to said second layer.

15. ) The apparatus of claim 2 wherein said optical switching element comprises a refraction index matched transparent fluid.

16. ) The apparatus of claim 15 wherein said index matched transparent fluid is to be actuated by at least one of electrostatic force, an air compressor, and an electromechanical actuator, a piezoelectric bulk acoustic wave actuator.

17. ) The apparatus of claim 16 wherein said electromechanical actuator is one of a piezoelectric bimorph actuator, an electret actuator, a MEMS actuator, a shape memory alloy actuator, a thermal mechanical actuator, a piezoelectric SAW actuator, a piezoelectric bulk acoustic wave actuator, a piezoelectric bimorph flexural acoustic wave actuator.

18. ) The apparatus of claim 17 wherein said piezoelectric SAW actuator comprises one of an inter-digitated drive, a SAW repeater, a plurality of inter-digitated transducers.

19. ) The apparatus of claim 17 wherein said piezoelectric bulk acoustic wave actuator comprises one of an inter-digitated drive, a bulk acoustic wave repeater, a plurality of inter-digitated transducers.

20. ) The apparatus of claim 17 wherein said piezoelectric flexural acoustic wave actuator comprises one of an inter-digitated drive, a bulk acoustic wave repeater, and a plurality of inter-digitated transducers.